Well, there was a civilization called Rome...ruled the world, after it fell the world descended into the dark ages
with christianity and Islam..

of course a total world government has never been tried before, but to me, something must be done about the current world situation and trying a world government would at least be an attempt at fixing things

of course to get ready for a world government we need to eliminate in-equality, culture and religion but to me that is ok as these are just artifacts of the old ways of thinking which have led us all into this mess